Example usage for com.google.common.base Optional fromNullable

Introduction

In this page you can find the example usage for com.google.common.base Optional fromNullable.

Prototype

public static <T> Optional<T> fromNullable(@Nullable T nullableReference)

Source Link

Document

If nullableReference is non-null, returns an Optional instance containing that reference; otherwise returns Optional#absent .

Usage

From source file:org.opendaylight.yangtools.yang.model.repo.api.YinTextSchemaSource.java

public static SourceIdentifier identifierFromFilename(final String name) {
    final String baseName;
    if (name.endsWith(YangConstants.RFC6020_YIN_FILE_EXTENSION)) {
        baseName = name.substring(0, name.length() - YangConstants.RFC6020_YIN_FILE_EXTENSION.length());
    } else if (name.endsWith(XML_EXTENSION)) {
        // FIXME: BUG-7061: remove this once we do not need it
        LOG.warn("XML file {} being loaded as YIN", name);
        baseName = name.substring(0, name.length() - XML_EXTENSION.length());
    } else {/*from  w  w w. ja v  a 2 s  .com*/
        throw new IllegalArgumentException("Filename " + name + " does not have a .yin or .xml extension");
    }

    final Entry<String, String> parsed = YangNames.parseFilename(baseName);
    return RevisionSourceIdentifier.create(parsed.getKey(), Optional.fromNullable(parsed.getValue()));
}

From source file:com.facebook.buck.util.environment.MacWifiSsidFinder.java

/**
 * Finds the SSID of the default Wi-Fi interface using Mac OS X APIs.
 *//*from www.  j a  v a 2s.co  m*/
public static Optional<String> findCurrentSsid() {
    LOG.debug("Getting current SSID..");

    // Grab a handle to the Objective-C runtime.
    Client objcClient = Client.getInstance();

    // Try the OS X 10.10 and later supported API, then fall
    // back to the OS X 10.6 API.
    Pointer wifiClientClass = RuntimeUtils.cls("CWWiFiClient");
    Optional<Proxy> defaultInterface;
    if (wifiClientClass != null) {
        LOG.verbose("Getting default interface using +[CWWiFiClient sharedWiFiClient]");
        defaultInterface = getDefaultWifiInterface(objcClient, wifiClientClass);
    } else {
        LOG.verbose("Getting default interface using +[CWInterface defaultInterface]");
        // CWInterface *defaultInterface = [CWInterface interface];
        defaultInterface = Optional.fromNullable(objcClient.sendProxy("CWInterface", "interface"));
    }
    return getSsidFromInterface(defaultInterface);
}

From source file:com.googlecode.blaisemath.style.ImmutableAttributeSet.java

/**
 * Makes an immutable copy of the provided attribute set.
 * @param set the set to copy//from   w  w  w  .java 2 s .  co  m
 * @param par the parent
 * @return an immutable copy
 */
static ImmutableAttributeSet immutableCopyOf(AttributeSet set, @Nullable AttributeSet par) {
    ImmutableAttributeSet res = new ImmutableAttributeSet();
    res.parent = Optional.fromNullable(par);
    res.attributeMap.putAll(set.attributeMap);
    return res;
}

From source file:storm.mesos.logviewer.LogViewerController.java

public LogViewerController(Map conf) {
    port = Optional.fromNullable((Number) conf.get(Config.LOGVIEWER_PORT)).or(8000).intValue();
    setUrlDetector(new SocketUrlDetection(port));
}

From source file:at.ac.univie.isc.asio.nest.InferJdbcSchema.java

@Nonnull
@Override// w  w w. java  2s .  co m
public NestConfig apply(final NestConfig input) {
    final Jdbc jdbc = input.getJdbc();
    final Optional<String> dataset = Optional.fromNullable(input.getDataset().getName())
            .transform(Functions.toStringFunction());
    if (jdbc.getSchema() == null) {
        jdbc.setSchema(JdbcTools.inferSchema(jdbc.getUrl()).or(dataset).orNull());
    }
    return input;
}

From source file:io.crate.sql.tree.ShowSchemas.java

public ShowSchemas(@Nullable String likePattern, @Nullable Expression whereExpr) {
    this.likePattern = Optional.fromNullable(likePattern);
    this.whereExpression = Optional.fromNullable(whereExpr);
}

From source file:org.jclouds.ultradns.ws.xml.UltraWSExceptionHandler.java

@Override
public UltraDNSWSError getResult() {
    return code != -1 ? UltraDNSWSError.fromCodeAndDescription(code, Optional.fromNullable(description)) : null;
}

From source file:com.comoyo.commons.amazonaws.AwsEC2InstanceIdentity.java

/**
 * Find AWS EC2 instance metadata for running host.
 *
 * @return optionally, a map of [key, value] pairs describing the
 * hosting EC2 instance.// w w  w.j  av  a  2 s  .  com
 */
public static Optional<Map<String, String>> getMetadata() {
    final Optional<Map<String, String>> metadata = metadataRef.get();
    if (metadata != null) {
        return metadata;
    }
    if (hypervisorAbsent()) {
        metadataRef.set(Optional.<Map<String, String>>absent());
        return metadataRef.get();
    }

    final ObjectMapper mapper = new ObjectMapper();
    try {
        final URL url = new URL(INSTANCE_DATA_URL);
        final URLConnection connection = url.openConnection();
        connection.setConnectTimeout(CONNECT_TIMEOUT_MS);
        connection.connect();
        final Map<String, String> response = mapper.readValue(connection.getInputStream(),
                new TypeReference<Map<String, String>>() {
                });
        metadataRef.set(Optional.fromNullable(response != null ? Collections.unmodifiableMap(response) : null));
    } catch (IOException e) {
        metadataRef.set(Optional.<Map<String, String>>absent());
    }
    return metadataRef.get();
}

From source file:org.opendaylight.distributed.tx.spi.CachedData.java

/**
 * Get the data from cache.
 *
 * @return optional of the data object.
 */
public Optional<DataObject> getData() {
    return Optional.fromNullable(data);
}

From source file:io.crate.sql.tree.OptimizeStatement.java

public OptimizeStatement(List<Table> tables, @Nullable GenericProperties properties) {
    this.tables = tables;
    this.properties = Optional.fromNullable(properties);
}